Casting apparatus



June 30, 1931. c U -1'0 CASTING APPARATUS Filed June 13, 1928 4 Sheets-Sheet l June 30, 1931. c, HUTTO 1,811,937

CASTING APPARATUS Filed June 13, 1928 4 Sheets-Sheet 3 3 I k \\\\\f a s;

June 30, 1931. M. c. HUTTO CASTING APPARATUS Filed June 13, 1928 4 Sheets-Sheet 4 Patented June 30, 1931 UNITED STATES PATENT. OFFICE MARSDEN C. HUTTO, OF DETROIT, MICHIGAN, ASSIGNOB TO H'UT'IO ENGINEERING COM- PANY, INC A CORPORATION OF MICHIGAN CASTING APPARATUS Application filed June 13,

This invention relates to a casting apparatus which is more particularly designed for producing a cast connection of babbitt solder or other self-hardening adhesive material between an abrasive member and a holder for use in a device whereby cylindrical surfaces are ground, although this apparatus may also be used to advantage for easting other articles of like character.

It is the object of this invention to provide a casting apparatus of this character which permits of expeditiously, conveniently and accurately casting metal or the like for connecting other members so that the latter are maintained in a correct technical position relative to each other and the parts of the grinding device with which they cooperate, and thereby enable the abrasive to be used without any preliminary dressing of its face to suit the work to be performed and also permit of wearing the abrasive uniformly and without undue waste.

In the accompanying drawings Figure 1 is a top plan view of the casting apparatus embodying my improvements and showing the movable parts forming the mold cavity in their open or separated posit-ion ready to receive an abrasive holder and an abrasive member which are to be connected by cast metal or similar material.

Figure 2 is a similar view showing the top parts of the apparatus removed and the movable parts forming the mold cavity closed and an abrasive member held in place relatively to this mold cavity preparatory to assembling an abrasive holder therewith and connecting this holder and abrasive by cast metal or its equivalent.

Figures 3 and 4 are vertical transverse sections taken on the correspondingly numbered lines on Figs. 1 and 2, respectively.

Figure 5 is a perspective view of an abrasive holder and an abrasive member secured in the holder by cast metal or other self-hardening fluid by the use of the apparatus forming the subject of this invention.

Figures 6 and 7 are vertical longitudinal sections taken on the correspondingly numbered lines on Figs. 2 and 1, respectively.

Figures 8 and 9 are fragmentary plan views an abrasive member 20,

1928. semi No. 284,941.

of the shifting plates forming parts of the means for clamping the abrasive holder and the abrasive member in place during the operation of casting a connecting member between the same.

Figure 10 is a vertical longitudinal section of the completed abrasive unit.

Flgure 11 is a cross section of taken on line 1111 Fig. 10.

Figure 1? is a. perspective view of the carriage forming part of the means for clampmg the end of an abrasive member in the mold.

Figure 13 is a similar view of the renewable aw for said carriage.

In the following description, similar characters of reference indicate like parts in the several figures of the drawings.

Although this apparatus with some modification can be adapted for producing the cast connection between two members of various kinds in order to maintain the same in a correct relative position, and enable the same to perform the intended technical operation with accuracy, the present machine has been designed primarily for producing a cast connection between an abrasive member or stone and a holder or carrier, so that the same forms a unit for use in a machine which is adapted to grind cylindrical surfaces such as the bore of cylinders and the periphery of wrist pms, cranks, shafts and the like.

The grlnding unit or stone set resulting from the use of the present machine is shown in Figs. 5, 10 and 11 and comprises generally a holder or carrier 21 and a cast connection 22 which serves to adhesively connect the abrasive member and the holder and maintain them in the proper relative position.

The abrasive member is not necessarily, constructed of carborundum 1n the form of a stick or bar which is rectangular in cross section. The holder is constructed in the form of a metal bar which is substantially U-shaped in cross section and provided on its face with a channel 23 which is somewhat undercut or of dove-tail form. A plurality of such holders are mounted in radial notches formed in laterally projecting the same preferably, though lugs on the body of a rotary head or body and are capable of radial adjustment thereon for varying the diameter of the grinding tool as a whole, as shown and described in the grinding apparatus on which application for Letters Patent was filed April 1, 1927, Ser. No. 180,159.

011 one sidethis holder is provided with laterally projecting pins or lugs 24 which are adapted to engage with the guide lugs of the body of the tool for the purpose of preventing this stone holder from moving lengthwise of the body, and at its opposite ends this holder is provided with pins or buttons 25 which are adapted to be engaged by springs in the manner set forth in the above mentioned application, for the purpose of yieldingly drawing the stone holder inwardly and causing the same to remain in engagement with the devices whereby radial adjustment of the same on the body of the tool is effected. The cast connection 22 between the abrasive member or stone and carrier preferably consists of self-hardening fluid which also has adhesive properties so that the same when poured into the space between the channel of the holder and the inner longitudinal portion of the stone arranged therein, will operate to reliably connect'these parts and secure the same rigidly in position so that the stone will not become displaced while in use.

This self-hardening material preferably consists of babbitt or solder, but any other suitable self-hardening material can be used. The material for this connecting member is poured while in a fluid state into the U- shaped space between the holder and abrasive member, and when hardened, the same is of U-shaped form in cross section and forms a web 26 between the bottom of the channel 23 and the rear side of the stone 20, and two longitudinal flanges 27 between opposite lateral sides of the stone 20 and the walls of the channel in the holder.

The molten material for the purpose of forming this connecting member 22 is preferably ponred into the cavity between the holdor and the stone through an inlet passage 28 formed in the back of the stone holder about midway between the ends thereof and extending from the rear side thereof to the bottom of the channel therein, as shown in Fig. 10.

On one of the longitudinal sides of the stone holder the same is provided with an opening 29 which is preferably elongated in the direction of the length of the holder and communicates with the cavity between the holder and the stone so that the metal or other material when poured into the cavity between the holder and the stone will also fill the opening 29. The latter thereby serves as a window through which a part of the metal forming the connecting member between the holder and stone, is ex osed on the side of the holder and permits 0 placing a mark on this connecting filling, as shown at 30, which indicates the particular grade or fineness of the grit which is used in the stone,

and thereby permits of conveniently storing and selecting stone sets in accordance with which receives the abrasive member or stone and the holder therefor, so that a cavity is formed between these members into which the molten self-hardening fluid is poured for connecting these members. This plate, as shown in the drawings, is connected by means of screws 33 with the base. 31, but any other suitable means for connecting the same may be, employed.

Upon the upper side of the bottom plate 32 adjacent to one of the longitudinal edges thereof is arranged a gage block which is substantially of L-shaped form in cross section so as to form a horizontal lower flange or bottom 34 and an upright flange or wall 35 rising from one edge of the lower flange 34. The face of the abrasive member or stone is adapted to be supported on the upper side of the mold bottom 34:, and in order to reduce the wear on this bottom due to the abrasive action of the grit in the stone, and also permit of renewing the surfaces of this mold bottom when necessary in order to accurately position the stone with reference to the holder with which the same is to be connected by the cast member,-the upper side of the mold bottom 34 is provided with renewable supporting or gage surfaces. v

In the preferred construction this is accomplished by means of two hardened steel pins 36 insert-ed transversely in openings 37 formed in the lower part of the lower mold block so as to extend through the upright wall thereof and also across the upper part of the mold bottom 34= so as to project slightly above the upper surface of this mold bottom, as shown in Fig. 6. These supporting pins 36 are preferably flattened on the upper side of their inner portions, as shown in Fig. 6, so as to present a comparatively wide bearing surface for engagement with the face of the abrasive member or stone. When these bearing pins become worn to such an extent that renewal of'the same is desirable; the same can be easily driven out of the opening of the lower mold block and replaced by new ones in order to maintain accuracy in the operation of casting a connector between the abrasive member and the holder.

By projecting the upper faces of the gage or supporting pins 36 slightly above the up per surfaces of the bottom 34, pockets 38 are formed on the upper side of the mold bottom 34 adjacent to the pins 36 which are adapted to receive any small particles of grit which may become detached from the abrasive members in the operation of inserting the same in the mold and thereby prevent such grit from interfering with placing the abrasive stone in the mold with its face in accurate engagement with the gage surfaces of the bottom of.

the mold cavity, and thereby insure proper positioning of this stone in the mold preparatory to assembling the same with a holder and connecting the same therewith by a cast metal connector. Any grit or dust which may become detached from the abrasive stone and fall into the pockets 38 may be removed therefrom at proper intervals so as to not interfere with the proper gaging of the stone in the mold.

As the abrasive stone 20 is placed upon the bottom or gage pins 36 the same is also engaged on one of its longitudinal sides with a gage surface 39 formed on the inner side of the wall 35 of the bottom block. The

front end of this abrasive stone also engages adjacent to its front end or face with an end stop 40 formed on the front end portion of the bottom or lower section of the mold. The abrasive member is held with its front end against this front stop 40 by a clamping jaw 41 engaging with the rear end of the stone, as shown in Fig. 6. This clamping jaw is capable of being removed as the same becomes worn, due to engagement with the rear end of the stones which when grit gets there having a wearing action on this clamping jaw, and for this purpose the latter is preferably con- Y structed in the form of a block having a contral opening 42 which receives a retaining pin 43 on the inner side of a carriage 44.

This carriage 44 is movable horizontally and lengthwise toward and from the rear end of the cavity within the mold, and in the preferred construction is guided in a guideway 45 which is formed between the upper side of the bottom plate 32 and a top plate 46 which is secured to the bottom plate 32, as best shown in Figs. 1 and 6.

The jaw 41 is yieldingly held in its forward or innermost position but may be positively retracted into its outermost or inoperative position. The means for yieldingly holding the jaw in its innermost position preferably consists of a spring 47 arranged within a recess 48 in the sliding carriage 44 and bearing at one end against the inner end of this slot 48 while its opposite end bears which is pivoted by means of a pin 51 on a lug 52 which projects rearwardly from the rear edge of the supporting block 32. This lever is provided with a lower handle 53 whereby the same is manipulated and with an upper arm 54 having a recess 55 which re ceives a pin 56 on the rear or outer part of the slide 44 which carries the jaw 41. By pressing downwardly on the handle 53 this hand lever is turned in the direction for moving the slide 44 and associated parts outwardly, while upon releasing the pressure on this lever permits the spring 47 to shift the slide 44 and the jaw 41 inwardly for clamping the stone 20 at its opposite ends between the stop 40 and this clamping aw 41.

The abrasive member or stone 20 is clamped against the gage face 39 of the wall 35 so as to hold the same firmly in place while the connecting member 22 is being cast between this stone and the'holder.

For this purpose the lower part of the longitudinal side of the stone opposite to that which is engaged by the gage face 39 is engaged by a clamping jaw 57 which is movable transversely toward and from the respective side of the stone. This longitudinal clamping jaw is nearly as long as the abrasive stone, and the same is preferably movable toward and from the respective side of the stone by means which will permit the lower jaw to swivel or swing in a horizontal plane for the purpose of enabling this jaw to adapt itself to the respective lateral longitudinal side of the stone and engage uniformly with the same throughout the length thereof.

For this purpose the means for shifting the lower stone clamping jaw is preferably constructed as follows The numeral 58 represents a horizontally and transversely movable slide which is guided in a way 59 formed between the upper side of the supporting plate 32 and guide blocks 60 secured transversely to the upper side of the plate 32 on opposite sides of the slide 58. This slide 58 is yieldingly moved toward the clamping jaw 57 by a pair of springs 61 arranged in recesses 62 formed in the sliding plate 58 and bearing at their inner ends against the inner ends of these slots 62, while their outer ends bear against abutment pins 63 which project fromthe supporting plate 32 upwardly into the slots 62, as best shown in Figs. 2 and 3.-

' Backward or outward movement of the jaw shifting plate 58 is effected by a cam mechanism which in the preferred construction comprises a horizontally and longitudinally movable cam bar 64 which extends over the upper side of the shifting plate 58 and is guided in suitable ways 65 formed between the lower guide blocks 60 and upper guide blocks 66 which are arranged above the lower guide blocks and are secured thereto by means of screws 67 or the like.

This cam bar 64 is provided with a depending pin 68 which engages with a cam slot 69 formed in the outer part of the slide 58, as best shown in Figs. 2, 4, 7 and 9. This cam bar is reciprocated lengthwise of the apparatus by motion which is derived from the lever 50 and this is preferably accomplished by means of a shifting rod 70 projecting outwardly from the outer end of the cam bar 64 and provided with an upright slot 71 as shown in Fi 7 which receives an extension 72 of the shi t' pin 56 which operates the end clamping jaw 4.1. By pressing downwardly on the handle 53 of the lever the cam bar 64: is moved longitudinally outward whereby its pin 68 engages with the cam surface of the slot 69 and thereby moves the shifting plate or slide 58 outwardly and retracts the clampin jaw 57 from its operative position with re erence to the abrasive member or stone 20 in the mold.

Upon releasing the downward pressure on the handle 53 the spring 4.7 operates to move the slide 4% inwardly whereby the cam bar 64: is shifted inwardly and the pin 68 is disengaged from the high part of the cam slot 69 whereby the springs 61 are permitted to move the slide 68 inwardly and yieldingly engage the clamping jaw 57 with the adjacent longitudinal side of the abrasive member 20 in the mold.

For the purpose of adjusting the cam action on the slide 58, the inner end of the rod 70 is provided with an external screw thread 73 which engages with the correspondingly threaded opening in a head 7 1 on the outer end of the cam bar 64:, whereby the distance between the shifting pin 72 and the cam pin 68 may be increased or decreased as required, by merely turning the shifting rod 70 with reference to the head 7 a in the proper direction.

After such adjustment the shifting rod 7 O is held in place by means: of a jamb nut 75 arranged on the threaded portion of this rod and engaging with the outer end of the cam head 74, as shown in Figs. 1, 2 and 7.

Although various means may be employed for producing a swivel connection between the clamping jaw 57 and the operating slide plate 58 so as to enable this jaw to adapt itself to any variations in the respective side of the stone or abrasive member, this is preferably accomplished by the means which are shown in the drawings. These means, as best shown in Figs. 2 and 4 consist of a. T- recess or opening 76 formed in the inner edge of the clamp actuating slide 58, and a T-shaped lug or head 77 projecting laterally outward from the central part of the clamping jaw 57 and arranged within thecorrespondingly shaped recess or socket 76 in the slide 58. The outer side of the swivel lug 77 preferably is tapered so as to produce in effect a fulcrum 78 at the summit of this tapering portion, which fulcrum bears against the central part of the bottom 79 of this recess, about which the clampin jaw 57 can rock as a vertical axis and there y ada t this jaw throughout its entire length to t e adjacent upright lateral face of the stone or abrasive member which is to be gripped. The inward movement of this jaw toward the stone is effected by engagement of the bottom of this recess 76 with the outer end of this swivel head 77 and outward movement of this clamping jaw is effected in unison with the slide 58 by engagement of the outwardly facing shoulders 80 in the T-shaped recess in the slide with inwardly facln shoulders 81 on the T-shaped swivel hea of the clamping jaw 57, as best shown in Fig. 2.

When the stone 20 is in its proper position within the mold and resting with its underside or face on the gage or supporting pins 36 and is gripped on its opposite or upright longitudinal faces by the gage wall 39 and the gripping jaw 57 the upp r or rear part of this stone projects above the top of the wall 35 and also above the gripping jaw 57, as shown in Fig. 4, thereby exposing the rear portion of the stone, which exposed portion forms part of the mold cavity into which the self-hardening material suc as solder or babbitt is poured for con ting the stone with the holder.

This holder is placed in an inverted position in the mold so that its channel faces downwardly and receives-the rear part of the stone but is separated from the latter by a U-shaped space which forms the cavity of the mold for producing the cast connector between the stone and holder, as shown in Fig. 4. When the holder 21 is thus placed in the mold, the edges of its flanges forming the channel therein rest upon the upper side of the wall 35 and the upper side of the jaw 57.

While the holder is in this position one of its lateral upright longitudinal sides is engaged with the inner face 82 formed on a wall 83 which overhangs the wall 35 and is secured to the adjacent part of the base plate 32 by means of screws 84, as shown in Figs. 2 and 4 or by any other suitable means. The opposite longitudinal upright side of the holder is engaged by an upper clamping jaw 85, which latter is formed on the inner end of a guide plate 88 which slides horizontally and transversely and is guided between the upper side of the slide 58 and jaw 57, and two inclined overhanging portions 86 formed on the upper guide plates 66 and engaging with Inward movement of this upper slide 88 for engaging the upper clamping jaw 85 with the adjacent upright longitudinal side of the holder is effected by spring means which in the present case consist oftwo springs 89 interposed between the outer end of the upper slide 88 and an abutment bar 90 mounted on the adjacent part of the supporting plate 32 and secured thereto by screws 91 or the like. Each of these springs is preferably held against displacement by engaging its inner end in a socket 92 formed in the outer end of the upper jaw slide while the outer end of this spring engages with a socket 93 in the abutment bar 90 and also receives a retaining pin 49 mounted on this abutment, shown in Fig. 4.

Disengagement of the upper jaw 85 from the respective longitudinal upright side of the stone holder is elfected by a shifting pin 95 arranged on the cam or shifting bar 64- and projecting upwardly into a cam slot 96 in the adjacent part of the upper slide 88. WVhen the shifting or cam bar 64 is moved outwardly the cam pin 95, by engaging with the high face of the cam slot 96, will cause the slide 88, carrying the upper jaw, to be withdrawn from the side of the holder, but when this bar 64 is released the springs 89 move this slide 88 inwardly and cause the upper jaw 85 to engage the respective side of the holder with a yielding pressure.

hen a stone has been thus placed within the mold and held against movement therein the metal or self-hardening fluid is poured through the opening 28 in the back of the holder which in effect forms a sprue so as to fill the U-shaped cavity which is formed in the mold between the rear portion of the stone and the channel in the holder.

Although the metal or other connecting material may be poured into this mold cavity by any suitable means this is preferably accomplished by a conical ladle or spout which is divided diametrically into two corresponding sections 9797 which are mounted on two shifting arms or levers 98 adapted to be moved horizontally toward and from each other by means of handles 99 at the front ends thereof, these levers being pivotally connected with each other at their rear ends and also pivotally mounted on the adjacent rear part of the base 31 by means of a vertical shown in Fig. 4, a downwardly tapering spout or ladle is formed through which the molten solder, lead, or the like may be conducted to the inlet or sprue 28 of the mold cavity in the top of the holder, it' being understood that the lower end of this ladle or spout at this time is in register with the upper end of the sprue 28 at this time and forms a practically tight joint with the holder so as to avoid the escape of anyself-hardening fluid at this point to the exterior of the mold.

The molten material is preferably supplied in excess of the requirements for completely filling the mold cavity so as to insure complete filling of the same, which excess material When hardened forms a stem 101 pro ject-ing outwardly from the mold inlet 28, as indicated by dotted lines in Fig. 4.

Upon separating the sections of the divided ladle or spout the latter may be disengaged from the conical waste stem 101.

Inasmuch as the mold cavity in this mold is formed by metal and stone surfaces, the selfhardenin fluid which is poured into the mold cavity hardens very rapidly and forms a rigid and firmly adhering connection between the stone and the holder so that these three parts may be removed from the mold immediately'after the pouring operation of the fluid material has been completed.

When this stone unit has been thus removed from the mold the same is in condition for immediate use with the exception that the waste stem 101 of the casting material has to be removed, which can be easily done by'a pair of snipper's or other severing instrument.

While the stone and the holder are being placed into the mold, the sections of the pouring ladle or spout are swung far enough apart so as to expose the upper side of the mold, as shown in Fig. 1, and thereby permit of conveniently placing a stone and holder within the mold and also removing these. parts after the same have been connected by the intervening member of self-hardening material 22. Inasmuch as the self-hardening material forming the connector between the stone and the holder may at times cause this unit to stick in the mold cavity, the removal of the same when such sticking occurs is facilitated by providing releasing notches 102 and 103 on the inner edges of the block 83, and the top plates 66 through which recesses releasing tools, such as a screw-driver, may be introduced for engaging the sides of the holder and forcibly prying the same out of the mold cavity.

In order to permit the stone holder or carrier 21 to be placed within the mold without 7 interference of its retaining pins 24 with any part of the mold, the face or inner end of the upper clamping jaw is provided with clearance notches, recesses or spaces 104 which receive the pins or projections 24 of the stone holder when the latter is placed in the mold, as shown by dotted lines in Fig. 1, preparaing or window 29 in one side of. the stone holder. It follows from this that when the metal or, other self-hardening material is poured into the mold cavity that such metal will also fill the window 29 and will receive an-imprint from the face of the die 106.

This imprint, as above stated, may indicate the size of the grit that has been used inthe manufacture of the stone but may be employed for any other designation for this particular stone unit, such as the size of the stone, its catalog number or some other indicia which may be useful in facilitating its use and distribution.

This die is preferably composed of a plurality of type which are arranged side by side in the recess 105 and removably held in place therein by means of a plate 107 secured to the top of the slide'88 by meansof' a screw 108 and having a hook 109 at its inner edge which engages with recessesllO formed in the upper side of the die typefas best shown-1n Figs. 1 and 4. v

In the operation of this machine the lever 50 is turned so as to withdraw the end gripping jaw 41 and the lower and upperside gripp1ngjaws57 and 85, thereby leavlng the mold open for thereception of the stone and the holder which are-intended to be connected. The .stone is now placed in the lower part of the mold cavity with its underside or face restin on the gage faces of the pins 36, one of its fingitudinal sides against the latteral gage face 39 and its front end in engagement with the end stop 40.

The lever 50 is now released sufficiently to permit the springs 61 to push the jaw 57 against the side of the stone whereby the latter is gripped in its proper centered position in the mold. The holder is now placed in the mold so that its cavity receives the upper exposed rear part of the stone, its flanges engage with the top of the wall 35 and the lower jaw 57, one of its longltudmal sides engages with the gage face 82 and the front end of the same engages with the front stop 111 formed by a lateral extension of the upper bar 83.

The lever 50 is now fully released so as to permit the springs 89 to move the upper aw 85 into engagement with the ad acent lateral side of the holder and also permit the front jaw 41 to engage with the front ends of the stone 20 and the holder 21, thereby grlpping the stone and holder and holding the same in the properly spaced relation with reference .to each other, so that upon subsequently ed with others in a grinding tool, the

holder will be in the correct technical position for cooperation with the adjusting mechanism of the tool, whereby Wear on the stone is taken up, and the face of the same will also be in the correct technical position for permitting immediate use of the tool without requiring the face of the stone to be dressed down for this purpose.

When the front and rear ends of the stone and stone holder are engaged by the sectional front stops 40, 111 and the rear jaw 41, the opposite ends of the mold cavity are virtually closed or sealed so that air within this cavity is permitted to escape but no appreciable amount of metal or other self-hardening fluid is permitted to. escape at these places during the operation of casting the connector between the stone and holder, thereby avoiding the necessity of trimming off any Waste material from the cast connector.

If,,during the operation of using this machine, the stone and holder are not pressed by hand against the fixed gage surfaces of the mold, such engagement will be automatically effected by the pressure of the jaws against the front ends and sides of the stone and holder whereby these parts will be auto matically centered relative to each other, when they are gripped in the mold preparatory to the pouring operation.

As a whole this machine is comparatively simple in construction, considering the function which it performs, and the same yields a comparatively large output with a minimum expenditure of labor, thereby enabling Work of this character to be produced expeditiously and at a low cost.

I claim as my invention 1. An apparatus for securing an abrasive member to a holder by a self-hardening fluid;

comprising a plurality of enclosure walls adapted to engage the abrasive member and the holder and to support the same in spaced relation to form a mold cavity between said walls, holder and abrasive member for receiving said self-hardening fluid.

2. An apparatus for securing an abrasive member to a holder by a self hardening fluid, comprisingaplurality of relatively movable walls adapted to engage the abrasive members and the holder and to support the same in spaced relation to form a mold cavity between said walls, holder and abrasive member for the reception of said self-hardening fluid.

3. An apparatus for securing an abrasive memberto a holder by a self-hardening fluid, comprising a mold having a gage surface adapted to be engaged by said abrasive mem- .a rasive member for producing her and a gage surface adapted to be engaged b said holder in spaced relation to said a cavity therebetween.

4. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and means for retaining the holder with its hollow side over the top of said abrasive member but spaced therefrom to form a U-shaped cavity therebetween for receiving said self-hardening 5. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to supportthe underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable aw adapted to engage with the opposite lateral side of said abrasive member, the upper faces of said side wall and jaw adapted to be engaged by the opposite edges of the channel shaped holder and form a U-shap ed cavity between said abrasive member and said holder, and means for retaining said holder against displacement. D

6. An apparatus for securlng an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a bottom adaptedto be engaged by the underside of said abrasive member, a fixed lower side wall adapted to be engaged by one of the lateral sides of the abrasive member, a lower clamping jaw movable toward and from the opposite lateral side of said abrasive member, said channel shaped holder being adapted to rest with its opposite edges on said lower'side wall and lower jaw and form a U-shaped cavity between the abrasive member and the holder, a fixed upper wall adapted to engage with one lateral side of said holder, and an upper clamplng jaw movable toward and from the opposite lateral side of said holder.

7. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and means for actuating said jaw including a shifting plate movable toward and from said abrasive member and connected therewith, spring means for moving said shifting plate toward said abrasive member, and cam means for moving said shifting plate away from said abrasive member. l

8. An apparatus for securing an abrasive I member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and means for actuating said jaw including a shifting plate movable toward and from said abrasive member and connected With said jaw and provided with a pin, a sliding bar providedwith a cam engaging with said pin, and a'rock lever connected with said bar.

9. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and means for actuating said aw including a shifting plate movable toward and from said abrasive member, and a swivel connection between said jaw and plate.

10. An apparatus for securing an abrasive member in the hollow side of a channel shaped-holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and, means for actuating said jaw including a shifting plate movable toward and from said abrasive member, and a swivel connection between said jaw and plate, consisting of a T-shaped lug on said jaw and a corresponding shaped recess in said plate receiving said lug.

11. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a fixed section forming a bottom adapted to support the underside of said abrasive member and a side wall adapted to be engaged by one of the lateral sides of the abrasive member, a movable jaw adapted to engage with the opposite lateral side of said abrasive member, and means for actuating said jaw including a shifting plate movable toward and from said abrasive member, and a swivel connection between said jaw and plate, consisting of a T-shaped lug on said jaw and a corresponding shaped recess in said plate receiving said lug, the outer end of said lug provided with a fulcrum which turns on the bottom of said recess.

12. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a surface adapted to be engaged by said abrasive member and a sur-' face adapted to be engaged by one lateral side of the holder, a clamping jaw adapted to engage the other lateral side of said holder, and means for actuating said jaw includin spring means for moving said jaw towar saidholder, and cam means for moving said jaw away from said holder.

13. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder b a self-hardening fluid, comprising a mold having a surface adapted to be engaged by said abrasive member and a surface adapted to be engaged by one lateral side of the holder, a clamping jaw adapted to engage the other lateral side of said holder. and means for actuating said jaw including a shifting plate carrying said aw and movable toward and from said holder and provided with a pin, a sliding bar provided with a cam engaging said pin and adapted to move said plate away from said holder, and spring means for moving said plate toward said holder.

14. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a surface adapted to be engaged by said abrasive member and a surface adapted to be engaged by said holder, a clamping jaw adapted to engage said abrasive member, a clamping jaw adapted to engage said holder, and means for actuating said jaws.

15. An-apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a surface adapted to be engaged by said abrasive member and a surface adapted to be engaged by said holder, a clamping jaw adapted to engage said abrasive member, a clamping jaw adapted to engage said holder, and means for actuating said jaws, including shifting plates connected with said jaws, spring means for moving said plates toward said abrasive member and holder, cams arranged on said plates, and a sliding bar provided with pins engaging said cams and adapted to move said plates away from said abrasive member and holder.

16. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a lower surface for engaging the underside of the abrasive member and an end surface to be engaged by one engaged with a lateral side 0 end of the abrasive member, means for retaining the abrasive member a ainst lateral movement and means for hol ing the abrasive member in the proper longitudinal position. 17. An apparatus for securing anabrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a lower surface for engaging the underside of the abrasive member and an end surface to be engaged by one end of the abrasive member, means for retaining the abrasive member a ainst lateral movement, and means for holding the abrasive member in the proper longitudinal position, including an end stop adapted to be engaged by one end of the abrasive member, and a clamping jaw engaging with the other end of the abrasive member.

18. An apparatus for securing an abrasive member in the hollow side of a channel shaped holder by a self-hardening fluid, comprising a mold having a lower surface for engaging the underside of the abrasive member and an end surface to be engaged by one end of the abrasive member, means for retaining the abrasive member against lateral movement, and means for holding the abrasive member in the proper longitudinal position, including an end stop adapted to be engaged by one end of said abrasive member, a clamping jaw adapted to enga e with the other end of said abrasive mem er, spring means for moving said j aw toward said abrasive member, and a rock lever connected with said jaw and adapted to move the same away from said abrasive member.

19. An apparatus of the character described, comprising a mold having a surface adapted to be engaged by an abrasive member and a surface adapted to be engaged by a holder for said member, a clamping aw adapted to engage with a lateral side of said abrasive member, a clamping jaw adapted to engage with a lateral side of said holder, a clamping jaw adapted to engage corresponding ends of said abrasive member and holder, and a unitary operating mechanism for said aws.

20. An apparatus of the character described, comprising a mold having a surface adapted to be engaged by an abrasive member and a surface adapted to be engaged by a holder for said member, a clamping jaw adapted to engage with a lateral side of said abrasive member, a clamping 'aw adapted to f said holder, a clamping jaw adapted to engage corresponding ends of said abrasive member and holder, spring means for moving said jaws toward said abrasive member and holder, cam means for moving said abrasive member and holder clamping jaws outwardly, and a single rock lever operatively connected with said cams.

21. An apparatus of the character described, comprising a mold having a cavity for the reception of an abrasive member, the bottom of said cavity havin elevated supportin surfaces to be engage by the underside 0 said abrasive member and recesses adjacent to said elevated surfaces for the reception of any grit which may become detached from said abrasive member.

22. An apparatus of the character described, comprising a mold having a cavity for the reception of an abrasive member, the bottom of said cavity having elevated supporting surfaces to be engaged by the underside of said abrasive member and recesses adjacent to said elevated surfaces for the reception of any grit which may become detachedfrom said abrasive member, said elevated surfaces being formed on hardened pins extending crosswise of the mold cavity.

23. An apparatus of the character described, comprising a mold having a surface to be engaged by an abrasive member and a surface to be engaged by a holder which is to be connected with an abrasive member by a self-hardening fluid, and a movable spout adapted to be brought in line with a passage leading to the space between said abrasive member and holder and to conduct the selfhardening fluid thereto. a

24. An apparatus of the character described, comprising a mold having a surfaceto be engaged by an abrasive member and a surface to be engaged by a holder which is to be connected with an abrasive member by a self-hardening fluid, and a movable spout adapted to be brought in line with a passage leading to the space between said abrasive member and holder and to conduct the selfhardening fluid thereto, said spout consisting of two conical sections which are pivotally connected to permit of completing or dividing the spout.

In testimony whereof I afiix m signature.

MARSDEN C. O. 

